According to the earliest existing mathematical document in the world-the scroll of Lint grass in Egypt, as early as 3600 years ago, Egyptians could solve mathematical problems with equations. China people also have a long history of studying equations. In Nine Chapters of Arithmetic, written about two thousand years ago, one chapter was named after Equation.
For a long time, the equation has no special expression, but is described by common language. It was not until 300 years ago that Descartes, a French mathematician, first advocated the use of letters such as X, Y and Z to represent unknowns, and the present equation was formed.
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An equation is an equation that represents the equal relationship between two mathematical expressions (such as two numbers, functions, quantities and operations), and the unknown number that makes the equation valid is called "solution" or "root". The process of solving the equation is "solving the equation".
By solving the equation, we can avoid the difficulty of reverse thinking and directly list the equations with the quantity to be solved. There are many forms of equations, such as one-dimensional linear equation, two-dimensional linear equation, one-dimensional quadratic equation and so on. , can also be combined into equations to solve multiple unknowns.
In mathematics, an equation is a statement containing one or more variables. Solving an equation involves determining which variables have values that make the equation valid. Variables are also called unknowns, and the value of the unknowns satisfying the equation is called the solution of the equation.